{"product_id":"value-collection-gh8815219-pilot-counterbore-21-64in","title":"Value Collection GH8815219 Pilot Counterbore 21\/64in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VALUE COLLECTION GH8815219 is a 3-flute interchangeable pilot counterbore designed for precision countersinking and seat preparation in metal fabrication and machining applications. Built from cobalt steel with a bright, uncoated finish, it delivers durability in demanding cutting conditions. The tool features a 21\/64-inch counterbore diameter and a 5\/16-inch straight shank, making it compatible with standard drill press and milling machine setups. Right-hand cutting geometry ensures clean, consistent material removal. With an overall length of 3-13\/16 inches, this counterbore suits a range of workpiece depths encountered in general machining and assembly operations.\u003c\/p\u003e\u003cp\u003eThis interchangeable pilot counterbore is intended for use in machine shops, aerospace fabrication, and general metalworking environments where accurate bolt-seat or fastener-head recesses are required. The cobalt construction makes it well-suited for harder ferrous materials, stainless steels, and high-temperature alloys where high-speed steel tooling may underperform. A licensed machinist or tool-and-die professional typically installs and operates this type of cutting tool in production or maintenance contexts.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e21\/64-inch counterbore diameter for precise fastener-head seating\u003c\/li\u003e\n\u003cli\u003eCobalt steel construction for improved heat and wear resistance in hard materials\u003c\/li\u003e\n\u003cli\u003e3-flute design provides balanced cutting action and smooth finish\u003c\/li\u003e\n\u003cli\u003eStraight 5\/16-inch shank for compatibility with standard drill chucks and collets\u003c\/li\u003e\n\u003cli\u003eBright, uncoated finish suitable for use with cutting fluids\u003c\/li\u003e\n\u003cli\u003eRight-hand cutting direction for use in standard spindle rotation setups\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with interchangeable pilots with a 3\/32-inch pilot shank diameter. Fits standard straight-shank tool holders and drill chucks accepting a 5\/16-inch shank.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and operation should be performed by a qualified machinist familiar with rotary cutting tools and machine tool setups. Secure the straight shank firmly in a matching collet or drill chuck before operation, and confirm the pilot fits freely in the pre-drilled pilot hole. Always power down and lock out the spindle before changing the pilot or inspecting the cutting edges. Use an appropriate cutting fluid for the workpiece material to extend tool life and improve surface finish.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCounterbore Diameter\u003c\/strong\u003e: 21\/64 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 5\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length (OAL)\u003c\/strong\u003e: 3-13\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 3-1\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePilot Shank Diameter Compatibility\u003c\/strong\u003e: 3\/32 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Cobalt Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright, Uncoated, Polished\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAircraft Style\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: VALUE COLLECTION\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: GH8815219\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51698605261106,"sku":"GH8815219","price":104.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f07088d5500d81bffb997b6517f514f2.jpg?v=1788365354","url":"https:\/\/voomisupply.com\/products\/value-collection-gh8815219-pilot-counterbore-21-64in","provider":"Voomi Supply","version":"1.0","type":"link"}